ML17303A677

Special Rept 2-SR-87-005-01:on 870110,high-range Noble Gas Activity Monitor Inoperable for Greater than 72 H.Monitor Removed from Svc to Allow Replacement of Memory Chip as Sys Upgrade.Monitor Declared Operable on 870316

ML17303A677
Person / Time
Site:	Palo Verde
Issue date:	11/05/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00302-JGH-T, 192-302-JGH-T, 2-SR-87-005-01, 2-SR-87-5-1, NUDOCS 8711160076
Download: ML17303A677 (5)

Text

REGULA Y INFORMATION DISTRIBUTI~YSTEM (RIDS)

ACCESSION NBR: 8711160076 DOC. DATE: 87/11/05 NOTARIZED: NO DOCKET FACIL: STN-50-529 Palo Verde Nuclear Stations Unit 2i Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION HAYNESi J. G. Arizona Nuclear Power Prospect (formerly Arizona Public Serv REC IP. NAME RECIPIENT AFF IL I AT ION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-SR-87-005-01: on 870110> high range noble gas activity monitor inoperable for greater than 72 h. Monitor removed from svc to allow replacement of memory chip as sos upgrade. Monitor declared operable on 870316.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: 50. 73 Licensee Event Report (LER)i Incident Rpti etc.

NOTES: Standardi zed plant. 05000529 RECIPIENT COPIES . RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 PD5 PD 1 1 LICITRA> E 1 1 DAVIS' 1 1 INTERNAL: ACRS MICHELSON 1 ACRS MOELLER 2 2 AEQD/DQA *EOD/DSP/NAS 1 1 AEOD/DSP/RQAB 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/DAB 1 1 DEDRQ 1 NRR/DEST/ADS 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1 NRR/DEST/ I CSB 1 1 NRR/DEST/MEB 1 NRR/DEST/MTB 1 1 NRR/DEST/PSB 1 1 NRR/DEBT/RSB 1 1 NRR/DEST/SGB NRR/DLPG/HFB 1 1 NRR/DLPG/GAB 1 1 NRR/DOEA/EAB 1 1 NRR/DREP/RAB 1 NRR/DREP/RPB 2.'

N IS/BIB 1, 1 NRR/PMAS/ ILRB 1 1 G FIL 02 1 1 RES DEPY GI 1 1 R FORDi J 1 1 RES/DE/EIB 1 1 RGN5 FILE 01 1 EXTERNAL: EG5G GRQHi M 5 5 H ST LOBBY WARD LPDR 1 NRC PDR NSIC HARRIS' 1 1 NSIC MAYSt G NOTES: 1 1 TOTAL NUMBER OF CQP IES REQUIRED: LTTR 47 ENCL 46

1 I

Arizona Nuclear Power Project P.O. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 192-00302-JGH/TRB November 5, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station Unit 2 Docket No. STN 50-529 (License NPF-51)

Supplement to Special Report 2-SR-87-005 File: 87-020-404 Attached please find a Supplement to Special Report 2-SR-87-005 prepared and submitted pursuant to Technical Specifications 3.3.3.8 and 6.9.2. This report discusses a radiation monitoring unit inoperable greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

'1f you have any questions, please contact Tom Bradish, Compliance Supervisor at (602) 393-3531.

Very trul yours, J. G. Haynes Vice President Nuclear Production JGH/TRB/cld Attachment cc: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. C. Sorenson J. R. Ball E. A. Licitra A. C. 'Gehr INPO Records Center rS 87>>>6OO76.87>>o>

PDR ADOCK 050O05~9 il 8

PALO VERDE NUCLEAR GENERATING STATION Radiation Monitoring Unit Inoperable for Greater Than 72 Hours License No. NPF-51 Docket No. STN 50-529 Special Report No. 2-SR-87-005-01 This supplement to Special Report 2-SR-87-005 is being submitted pursuant to Technical Specification (T.S.) 3.3.3.8 ACTION 42b and T.S. 6.9.2 to report an event in which a high range noble gas activity monitor (RU-146) was inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit for operability was exceeded at approximately 0630 MST on January 10, 1987. Pursuant to T.S. 3.3.3.8 ACTION 42a the Preplanned Alternate Sampling Program was initiated to monitor the plant ventilation system.

During a routine review of submitted Special Reports, it was discovered that RU-146 was removed from service at 0630 MST on January 7, 1987, to allow the replacement of eraseable programmable read only memory (EPROM) chips as a system upgrade. After replacement of the EPROM, RU-146 was reenergized but not declared operable.

At 0500 MST on January 11, 1987, Unit 2 entered Mode 5. Since RU-146 is not required to be operable in Mode 5, the document which tracks the status of Technical Specification equipment, Technical Specification Component Condition Record (TSCCR), was notated to reflect that fact. However, it was not realized by the operators that the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Action Requirement to restore RU-146 to operability had been exceeded at 0630 MST on January 10, 1987.

On Febru'ary 19, 1987, surveillance testing on RU-146 was started. During the testing, it was identified that alarms would cycle on and off at random

'ntervals. Troubleshooting of the monitor was continued under the work. document authorized for replacement of the EPROM's. At 0607 MST on March 5, 1987, Unit 2 entered Mode 4 reinstating the requirement for RU-146 to be operable. At 2252 MST on March 5, 1987, RU-146 was declared inoperable due to the ongoing troubleshooting conducted under the EPROM replacement work order. The applicable ACTION requirements of T.S. 3.3.3.8 were initiated.

The troubleshooting revealed the cause of the random cycling alarms to be the micro computer software. As corrective action, Plant Change Request (PCR) 87-13-SQ-020 was initiated to correct the micro computer software. As additional corrective action, an Engineering Evaluation Request (EER) 87-SQ-101 was initiated to address the potential of similar cases in other monitors encompassing all three units. The disposition of this EER determined that all effected monitors are operable since these cycling alarms do not affect the monitors'perability per Technical Specifications. This software problem exists in this software revision, as well as previous software revisions.

To return RU-146 to service, Quarterly Functional Test 36ST-9SQ04 was successfully performed. The monitor was declared operable at 1414 on March 16, 1987. The monitor was inoperable in the applicable modes for approximately 15 days, 64 hours7.407407e-4 days <br />0.0178 hours <br />1.058201e-4 weeks <br />2.4352e-5 months <br />.